Shoptalk—deciphering architectural and historic preservation jargon one word at a time!
Historically, brick buildings were load bearing construction and the brick was both finish and structure and relied on multiple vertical layers or wythes of brick. The stacking or bonding of the brick in such structures usually exhibits the manner in which the layers of the wall tie together. In the modern era, brick has typically been used as a veneer and the bonding pattern generally is described as running bond. This visual difference is usually used to differentiate historic and modern use of brick. But there are a few historic buildings that exhibit running bond pattern for the exterior finish. Such buildings typically utilized concealed headers, sometimes called diagonal headers.
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Historic detail: running bond with concealed header (Source: International Text Book Company, International Library of Technology 31D, 1923)